Method of making a tight package provided with windows

ABSTRACT

A method for making a carton which is lined with an impervious transparent material and is provided with a window over which the transparent material is disposed to permit viewing of contents.

United States Patent Inventor Toivo Arttnri llakala Kauttua. FinlandAppl. No. 822,923

Filed May 8, 1969 Patented Aug. 10, 1971 Assignee AB Alrerlund 8:Ransing Lund, Sweden Priority May 8, 1968 Sweden 6197/68 METHOD OFMAKING A TIGHT PACKAGE PROVIDED WITH WINDOWS 3 Claims, 3 Drawing Figs.

US. Cl. 93/3631, 93/366 Int. Cl B311: 7/00 Field Search 93/3601, 36.6,35-, 229/14 BA, 14 BL [56] References Cited UNITED STATES PATENTS3,379,102 4/1968 James et al. 229/14 X 3,097,574 7/1963 Kuchenbecker93/366 X 2,748,673 6/1956 Winstead 93/35 3,040,963 6/1962 Turpin 229/143,073,216 1/1963 Gaunt 93/3601 1,745,385 2/1930 Smith 93/366 2,135,40911/1938 Munn eta]... 93/3601 2,241,710 5/1941 Lowey .1 229/14 PrimaryExaminer-Theron E. Condon Assistant Examiner-Horace M. CulverAttorney-Pierce, Scheffler & Parker ABSTRACT: A method for making acarton which is lined with an impervious transparent material and isprovided with a window over which the transparent material is dis osedto permit viewing of contents.

PATENTEU AUG 1 0 Ian SHEET 1 BF 2 PATENTEU AUG! 0 an:

SHEET 2 BF 2 METHOD OF MAKING A TIGHT PACKAGE PROVIDED WITII WINDOWS Thepresent invention relates to a method of making a tight package providedwith windows, comprising a carton sleeve with suitable end closure flapsand an inner lining.

The method according to the invention includes the following steps:

a. Out of a carton sheet openings are punched out, intended to serve aswindows in the completed carton.

b. The carton sheet is laminated over its whole surface with a lining ofa transparent plastic film or the like, which also extends over andcloses said openings.

c. Sleeve blanks are punched out in register with said openings.

d. The separate sheet blanks are glued, e.g. by a method known per se toform a sleevelike structure.

e. The lining is provided with a bottom by attaching a wafer across thelower opening by sealing it to the lining along the edge of this openingand to the end closure flaps which are folded outwardly, the samematerial being preferably chosen for the lining and the wafer, afterwhich the package is ready for filling and a subsequent sealing of theupper opening which is preferably sealed in the same way as the loweropening.

When making carton sleeves the blanks are normally made in the form oflarge sheets. It is these sheets, which are used as the basic materialby the method according to the present invention. After the sheets areappropriately printed the desired windows are punched out of the sheet.After that, the sheets are covered with plastic either by a normalextrusion proceeding or by glueing a prefabricated plastic film to thecarton sheets. After this the individual sleeve blanks are cut out in anormal way.

By the present invention many benefits are obtained. For example a veryrational method of making a large number of windows at the same time.Due to the fact that the coating at the same time serves as a lining andcovers the whole inner surface of the sleeve and the windows that thefinal package can be made very tight. Also the closure of the sleeve ismade very tight due to the fact that a wafer can be very easily tightlyattached to the lining of the end closure flaps folded outwardly alongthe edge of the mouth of the sleeve.

The invention is especially intended to be employed for a foldablecarton sleeve intended for home freezing, it will be described in thefollowing with reference to the accompanying drawings, which show such asleeve.

FIG. I shows a plain packaging blank, which has been punched out of alarger carton sheet in accordance with the above description.

FIG. 2 shows at perspective a package erected and closed in one end, thepackage being made according to the method of the invention.

FIG. 3 finally, shows the closed end of the same package in a positionin which the package has been partly compressed.

The present package consists of a body part fonned as a sleeve with foursidewalls I,2,3 and 4. From these sidewalls four bottom flaps 5,6,7 and8 and four top flaps 9,10,]! and 12 extend. Furthermore the blank shownin FIG. I comprises a sealing zone 13 with sealing flaps l4 and I5,which are meant to be joined with the sidewall I and the top and bottomflaps 9 and respectively. Finally FIG. I shows a window opening 18punched out of the carton blank and provided with a window 19. Thiswindow 19 consists preferably of a polyethylene film, which covers, inaccordance with the invention, the whole inside of the sleeve, its flapsincluded.

The blank shown in FIG. .I is intended to be folded to the shape shownin FIG. 2. In this position you close the end of the package, whichlater is meant to be its bottom, with a wafer I6. The wafer 16 ispreferably made of the same material as the lining 19. Alternatively,the wafer I6 can be made of plastic-coated paper with good extensioncapacity. The wafer 16 is secured around the mouth of the package b themeans of heat sealing. The cuts, which separate the end aps of that endof the package, which is closed by the wafer, are preferably not out tooclose to the body part of the sleeve. Due to this fact the tightening ofthe package is facilitated by ohtaining a stretching of the lining filmI9 in the four corners of the package at this end when the end flaps 5-8are folded out to the position shown in FIG. 2.

In the example shown, two of the sidewalls of the package, namely thesidewalls l and 3 and the end flaps 5,7,9 and II joined with thesesidewalls, are provided with central longitudinal crease lines 17, alongwhich the package in empty condition can be pressed flat, the lastmentioned sidewalls and the end flaps as well as the wafer 16 beingbellowfolded. How this folding is accomplished is shown in FIG. 3. Inthis figure the folding has however only begun. in practice the blank isfolded completely flat, that is until the sides 2 and 4 and the endflaps 6 and 8 get into contact with each other.

Of course, the invention is not restricted only to the embodimentdescribed above, but may be varied within the scope of the followingclaims. For instance the shape of the different flaps may be varied.That is also true about the choice of the material. Preferablyliquidtight materials are used for the lining as well as for the wafer,so as to provide a guaranteed liquidtight and robust package havingwindows due to the fact that the wafer 16 is well protected inside thebottom flaps 5- 8.

Iclaim:

I. -A method of making an impervious package suitable for liquids andhaving a window therein for viewing the contents comprising,

punching openings in a sheet of carton material at spaced locationstherein, said openings forming windows in the finished packages,

laminating a sheet of transparent, flexible impervious material onto theentire sheet of carton material and over said punched openings, to forma liner for the finished packages,

stamping package blanks from said laminated sheet, said blanks beingregistered with said window openings and being provided with end flapsat each end of the blanks and a sealing flap along a side,

folding each blank along parallel lines between the flaps at the opposedends thereof to form a sleevelike rectangular structure with a window onone side thereof, and two pairs of opposed end flaps at each endthereof, the sealing flap extending along one side thereof and'thetransparent sheet forming a liner therefor,

sealing said sealing flap to the juxtaposed side to close the sleevelikestructure,

folding the flaps at one end of the structure outwardly,

securing a wafer of flexible, impervious material to the liner materialon a pair of opposed outwardly folded end flaps, said wafer extendingbeyond the edges of said opposed end flaps so that the edges of saidwafer are also secured to the liner material of the other pair ofoutwardly folded end flaps,

whereby the flaps and attached wafer may be folded inwardly and sealedto close the end of the sleevelike structure for filling the package,and the end flaps at the opposite end may be sealed thereafter.

2. A method as claimed in claim I wherein the sheet of transparentflexible material is laminated to the sheet of carton material at allpoints on the adjoining surfaces.

3. A method as claimed in claim I wherein the sheet of transparentflexible impervious material and the wafer are of the same material andsaid material is heat scalable.

1. A method of making an impervious package suitable for liquids andhaving a window therein for viewing the contents comprising, punchingopenings in a sheet of carton material at spaced locations therein, saidopenings forming windows in the finished packages, laminating a sheet oftransparent, flexible impervious material onto the entire sheet ofcarton material and over said punched openings, to form a liner for thefinished packages, stamping package blanks from said laminated sheet,said blanks being registered with said window openings and beingprovided with end flaps at each end of the blanks and a sealing flapalong a side, folding each blank along parallel lines between the flapsat the opposed ends thereof to form a sleevelike rectangular structurewith a window on one side thereof, and two pairs of opposed end flaps ateach end thereof, the sealing flap extending along one side thereof andthe transparent sheet forming a liner therefor, sealing said sealingflap to the juxtaposed side to close the sleevelike structure, foldingthe flaps at one end of the structure outwardly, securing a wafer offlexible, impervious material to the liner material on a pair of opposedoutwardly folded end flaps, said wafer extending beyond the edges ofsaid opposed end flaps so that the edges of said wafer are also securedto the liner material of the other pair of outwardly folded end flaps,whereby the flaps and attached wafer may be folded inwardly and sealedto close the end of the sleevelike structure for filling the package,and the end flaps at the opposite end may be sealed thereafter.
 2. AmethOd as claimed in claim 1 wherein the sheet of transparent flexiblematerial is laminated to the sheet of carton material at all points onthe adjoining surfaces.
 3. A method as claimed in claim 1 wherein thesheet of transparent flexible impervious material and the wafer are ofthe same material and said material is heat sealable.